11921575243 has 2 divisors, whose sum is σ = 11921575244. Its totient is φ = 11921575242.

The previous prime is 11921575219. The next prime is 11921575297. The reversal of 11921575243 is 34257512911.

11921575243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (34257512911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11921575243 - 2³³ = 3331640651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11921575196 and 11921575205.

It is not a weakly prime, because it can be changed into another prime (11921575643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960787621 + 5960787622.

It is an arithmetic number, because the mean of its divisors is an integer number (5960787622).

Almost surely, 2^11921575243 is an apocalyptic number.

11921575243 is a deficient number, since it is larger than the sum of its proper divisors (1).

11921575243 is an equidigital number, since it uses as much as digits as its factorization.

11921575243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The spelling of 11921575243 in words is "eleven billion, nine hundred twenty-one million, five hundred seventy-five thousand, two hundred forty-three".